# The Mass-Size Relation From Clouds to Cores. I. A New Probe of Structure In Molecular Clouds

 Title: The Mass-Size Relation From Clouds to Cores. I. A New Probe of Structure In Molecular Clouds Author: Kauffmann, Jens; Pillai, Thushara; Shetty, Rahul; Myers, Philip C.; Goodman, Alyssa A. Note: Order does not necessarily reflect citation order of authors. Citation: Kauffmann, Jens, Thushara Pillai, Rahul Shetty, Philip C. Myers, and Alyssa A. Goodman. 2010. The mass-size relation from clouds to cores. I. A new probe of structure in molecular clouds. The Astrophysical Journal 712(2): 1137-1146. Full Text & Related Files: Kauffmann_MassSize.pdf (861.8Kb; PDF) Abstract: We use a new contour-based map analysis technique to measure the mass and size of molecular cloud fragments continuously over a wide range of spatial scales $$(0.05 \leq r/pc \leq 10)$$, i.e., from the scale of dense cores to those of entire clouds. The present paper presents the method via a detailed exploration of the Perseus molecular cloud. Dust extinction and emission data are combined to yield reliable scale-dependent measurements of mass. This scale-independent analysis approach is useful for several reasons. First, it provides a more comprehensive characterization of a map (i.e., not biased toward a particular spatial scale). Such a lack of bias is extremely useful for the joint analysis of many data sets taken with different spatial resolution. This includes comparisons between different cloud complexes. Second, the multi-scale mass-size data constitute a unique resource to derive slopes of mass-size laws (via power-law fits). Such slopes provide singular constraints on large-scale density gradients in clouds. Published Version: doi:10.1088/0004-637X/712/2/1137 Other Sources: http://arxiv.org/abs/1002.0608 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4214907

### This item appears in the following Collection(s)

• FAS Scholarly Articles [7374]
Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University